The new publication examines the potential impacts of climate change, including rising temperature, rising sea levels and increasing storm intensity, and proposes strategies for managing them. In the report, event probabilities are indicated using the phrases “virtually certain” (a 99% to 100% probability), “very likely” (a 90% to 100% probability), and “likely” (66% to 100% probability).

The report’s findings include:

Global nighttime and daytime temperature extremes are “very likely” to increase, with an “overall decrease in the number of cold days and nights, and an overall increase in the number of warm days and nights.” This is “likely” to be the result of human activity, the report states.

Climate change models predict a “substantial” increase in temperature extremes by the end of the 21st century. “It is very likely that the length, frequency and/or intensity of warm spells, or heat waves, will increase over most land areas…. A 1-in-20 year hottest day is likely to become a 1-in-2 year event by the end of the 21st century in most regions.”

The frequency of heavy precipitation events is “likely” to increase over many areas of the globe, in particular high latitudes and tropical regions. In addition, “heavy rainfalls associated with tropical cyclones are likely to increase with continued warming.”

The maximum wind speed of the average tropical cyclone is “likely” to increase. On the other hand, the global frequency of cyclones is “likely” to decrease or remain unchanged.

Because of increases in mean sea level, it is “likely” that has there has already been an increase in coastal high water extremes. Continuing increases in sea levels are “very likely” to contribute to upward trends in extreme coastal high water levels in the future.

There is “high confidence” that coastal locations currently suffering from erosion and flooding will continue to do so because of rising sea levels.

The combination of rising sea levels with increased maximum wind speeds of tropical cyclones are “very likely” to pose a problem for tropical island states.

Temperature changes in mountainous regions that result in glacial retreat or permafrost degradation could trigger “slope instabilities, movements of mass, and glacial lake outburst floods.” In addition, “changes in heavy precipitation will affect landslides in some regions.”

The report summary concludes with a table of risk management strategies. These include tactics for reducing exposure and vulnerability, sharing risk, increasing resilience, and improving recovery efforts.

Media/analysis tips

Reporter's use of the report: Evaluate what the reporter chose to include and exclude from the report. Would the audience have acquired a clear understanding of the report's findings and limits from this article?

Reporter's use of other material: Assess the material in the article that is not derived from the report. (For example: Does the reporter place the report in the context of other research and to what effect? Does the reporter include reactions to the report from other researchers or interested parties [e.g., political groups, business leaders, or community members] and are their credentials or possible biases made clear?)

If you had written an article based only on the press release, what would have been its main shortcoming(s)?

Newswriting assignments

Write a lead (or headline or nut graph) based on the report.

Spend 60 minutes exploring the issue by accessing sources of information other than the report. Write a lead (or headline or nut graph) based on the report but informed by the new information. (Does the new information significantly change what one would write based on the report alone?)

Interview two sources with a stake in or knowledge of the issue. Be prepared to provide them with a short summary of the report in order to get their response to it. Write a 400-word article about the report incorporating material from the interviews.

Spend additional time exploring the issue and then write a 1,200-word background article, focusing on major aspects of the issue.